Moved api-clients/resource-test-utilities to require-dev

Author: WyriHaximus

composer.json

@@ -15,11 +15,11 @@
     "api-clients/foundation": "dev-master",
     "api-clients/middleware-json": "^1.0",
     "api-clients/middleware-user-agent": "^1.0",
-    "api-clients/resource": "^3.0",
-    "api-clients/resource-test-utilities": "dev-master"
+    "api-clients/resource": "^3.0"
   },
   "require-dev": {
     "api-clients/resource-generator": "dev-master",
+    "api-clients/resource-test-utilities": "dev-master",
     "api-clients/test-utilities": "^3.0.1"
   },
   "autoload": {